Update cheatsheets

tldr/linux/cec-client

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+---
+syntax: markdown
+tags: [tldr, linux]
+source: https://github.com/tldr-pages/tldr.git
+---
+# cec-client
+
+> Manage serial bus CEC connections.
+> See also: `cec-ctl`.
+> More information: <https://manned.org/man/cec-client>.
+
+- List all CEC adapters:
+
+`cec-client {{[-l|--list-devices]}}`
+
+- Start an interactive CEC session:
+
+`sudo cec-client`
+
+- Set the On-Screen Display name:
+
+`sudo cec-client {{[-o|--osd-name]}} {{name}}`
+
+- Send a single command:
+
+`echo {{on 0}} | sudo cec-client {{[-s|--single-command]}}`
+
+- Set a device to standby in interactive mode:
+
+`standby {{0}}`
+
+- Turn a device on in interactive mode:
+
+`on {{0}}`